Enable TRIM On SSD (Solid-State Drives) In Ubuntu For Better Performance ~ Web Upd8: Ubuntu / Linux blog
▻http://www.webupd8.org/2013/01/enable-trim-on-ssd-solid-state-drives.html
TRIM allows the OS to “inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally”. Without using TRIM, the SSD speed decreases after a while so if you have a solid-state drive that supports TRIM, you should enable it so your SSD remains fast over time.